opencv write text on image python

cv2.imwrite () method is used to save an image to any storage device. Hello fellow learner! img: The Image on which you want to write the text. Python & OpenCV Projects for $30 - $250. Now that you have made the changes to image, save it with save () command. We will use this blank image to write text onto it. Approach Import module. deep learning ocr using tensorflow and python, deploying a keras deep learning model as a web application, how to make your windows laptop machine learning deep, image processing using python opencv keras and tensorflow, natural language processing with deep learning in python, deep learning OpenCV program in python to demonstrate putText () function using which we are going to write a text on the image and display the image with text written on it as the output on the screen: Code: #importing the modules opencv import cv2 #reading the image on which the text is to be written using imread () function Following are the input and output images. PIL . The approximate shape of the text in the example above is (268, 36). Write A Comment Cancel Reply. OpenCV cv2.putText() does not have any built-in capabilities to have a background color for the text. Color Filtering - OpenCV with Python for Image and Video Analysis 7. As a first step, we read the image "starry_night.jpg" from the OpenCV samples. We can put text on images in OpenCV python quite easily by using cv2.putText () function. Documentation: rectangle () Draws a simple, thick, or filled up-right rectangle. This library is written in optimised C/C++ and is supported on Windows, Linux, Android, and MacOS. In this tutorial, we are going to share code that prints any text on an image with a different style using the Python OpenCV library using the cv2.putText () function. 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First we will import PIL library into our code. OCR can detect several languages, for example, English, Hindi, German, etc. In the above example, we have provided a sample image, and wrote some text on the image. In this blog, we will discuss how to write the rotated text using OpenCV-Python. The usage of putText() function is provided in the following example. uint8) text: The text you want to write on the image. This will save the image according to the specified format in current working directory. NumPy gcd Returns the greatest common divisor of two numbers, NumPy amin Return the Minimum of Array Elements using Numpy, NumPy divmod Return the Element-wise Quotient and Remainder, A Complete Guide to NumPy real and NumPy imag, NumPy mod A Complete Guide to the Modulus Operator in Numpy, NumPy angle Returns the angle of a Complex argument. Next Post. Add Text to Image. Third, close the file using the close () method. position: distance along horizontal and vertical axis from top left corner of the image. So lets get started. In this video on OpenCV Python Tutorial For Beginners, I am going to show How to Read, Write, Show Images in OpenCV. org Bottom-left corner of the text string in the image. You have post at least three questions about get filenames with "PostPath". Instead of loading an image in our program, we have filled matrix with white color, and then we put the text in that matrix. Write Text on images in real-time using OpenCV-Python In this blog, we will learn how to use OpenCV cv2.putText () function for writing text on images in real-time. Import the ImageFont to our script so it becomes like this: from PIL import Image, ImageDraw, ImageFont. We can create a small rectangle of the desired color on the image and put text on the rectangle. We can put text on images in OpenCV python quite easily by using cv2.putText() function. Steps to start text extraction Let's start the text detection and extraction project development Install required libraries To install the libraries use pip installer from the command prompt / terminal: Pip install opencv-python Pip install pytesseract pip install tkinter Create main.py Create main.py file and add the following code Code: Save Image. To celebrate the 20th anniversary of the OpenCV library, Luxonis partnered with the official OpenCV.org organization to create the OpenCV AI Kit, an MIT-licensed open-source software API, and Myriad X-based embedded board/camera. The syntax of this function is shown below - Syntax cv2.putText (img, text, org, fontFace, fontScale, color, thickness) img - It is the image on which the text has to be written. OpenCV as such do not provide any function for doing this. Some popular real-world examples are: putText(), Python OpenCV & PyQT5 together In OpenCV, we can put some text in the image by using puttext() function. Save Image. So, let's discuss an alternative way to do this. Image Segmentation using K-means. You can easily do it by following Life2Coding's tutorial on YouTube: Linking OpenCV with Python 3 Goals: The goal is to make you understand how to put text on image using Python OpenCV. add a comment First, open the text file for writing (or append) using the open() function. It's free to sign up and bid on jobs. We and our partners use cookies to Store and/or access information on a device.We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development.An example of data being processed may be a unique identifier stored in a cookie. Python Opencv Write Text On Image With Code Examples. Trying to do some steganography and embed binary messages in images. In this first example, we will write a simple text on the blank image whose color is green, font is FONT_HERSHEY_TRIPLEX, font scale is 3 and thickness is 3. The next argument is the actual text string that we want to annotate the image with. In this program, we will write text on an image using the opencv function putText (). To write text on image with OpenCV library of Python, use putText() method. Originally developed by Intel, it was later supported by Willow Garage then Itseez (which was later acquired by Intel).The library is cross-platform and free for use under the open-source Apache 2 License.Starting with 2011, OpenCV features GPU acceleration for real . Put Text on Image in OpenCV Python using cv2.putText() with Examples. AboutPressCopyrightContact. Write code using OpenCV Python to process both images for subject 1and subject 2. This approach produces almost the expected results. Rectangle in OpenCV Python : cv2. OpenCV-Python is a library of Python bindings designed to solve computer vision problems. Figure 1: Customized PyTorch installation command. (X coordinate value, Y coordinate value).font: It denotes the font type. Add Text to Image. Tap the Text tool and enter your desired text. rectangle(), Add Text to Photos on Android Using Google Photos. text Text string to be drawn. True if the image is successfully written and False if the image is not written successfully to the local path specified. In the above example, we have provided a sample image, and wrote some text on the image. We will use programming in this lesson to attempt to solve the Python Opencv Write Text On Image puzzle. 5.4 iv) Applying K-Means for Image Segmentation. . At this point, you should be able to execute the following lines of code in your notebook: import cv2. 1 import cv2 After that, we will load an image from the file system with a call to the imread function. You have entered an incorrect email address! A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. [2022] 6 Jupyter Notebook Cloud Platforms with GPUs One Click Introduction to Machine Learning A simple explanation for beginners. text It is the text that needs to be put on the image. When it comes to OpenCV (Python), things are very easy and many things are just 1 step away. . Open targeted image. Write Text on images using OpenCV Python Published on May 16, 2021. OpenCV supports a wide variety of programming languages like Python, C++, Java, etc. Manage SettingsContinue with Recommended Cookies. Processed images for each subject should be ideal for facial recognition accuracy. How do I edit text in an image in Python? The image could contain machine-printed or handwritten text. UNIVERSITE KASDI MERBAH OUARGLA. 49 views OpenCV can also be used to write text on images. OpenCV-Python is a library of Python bindings designed to solve computer vision problems. I have a python program that combines different image layers. Hope you found this quick tutorial on writing text on images in OpenCV quite helpful. In this tutorial we will learn how to draw text on an image, using Python and OpenCV. January 20, 2022. Write text on an image using OpenCV - Python In this article, we will see how to write text on an image in less than one minute! Draw Rectangle, Print Text on an image | OpenCV Tutorial by Indian AI Production / On February 3, 2021 / In OpenCV Project In Python OpenCV Tutorial, Explained How to put text and rectangle over the image using python OpenCV? Original Image Algorithm Step 1: Import cv2 Step 2: Define the parameters for the puttext ( ) function. In OpenCV, we can put some text in the image by using puttext () function. This is demonstrated by the following code. The input image. Learn how to translate an image using OpenCV and Python. Syntax: cv2.imwrite (filename, image) Parameters: filename: A string representing the file name. 5.5 v) Image Segmentation Results for Different Values of K. 6 2. Badly. python write text to image opencvpython write text to image opencv Introduction. lineType Type of the line, such as filled line . . position: distance along horizontal and vertical axis from top left corner of the image. And the one step is the assumption. Some of font types are FONT_HERSHEY_SIMPLEX, FONT_HERSHEY_PLAIN, , etc.fontScale: Font scale factor that is multiplied by the font-specific base size.color: It is the color of text string to be drawn. The consent submitted will only be used for data processing originating from this website. NumPy matmul Matrix Product of Two Arrays. The method uses following parameters. Swift Problem change text color in datepicker format. In the most common color space, RGB (Red Green Blue), colors are represented in terms of their red, green, and blue components. This may be: IMREAD_COLOR loads the image in the BGR 8-bit. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. MLK is a knowledge sharing platform for machine learning enthusiasts, beginners, and experts. OpenCV stands for Open Source Computer Vision Library. We can use the putText () function of OpenCV to put text on an image with our desired color, font size, font family, and location. You can also select the color of text from this screen. Numpy Operations numpy.sum() , numpy.subtract() , numpy.multiply() , numpy.dot() , Matplotlib Scatter Plot Complete Tutorial for Beginners. As input, we pass the path to the image we want to use. Use the putText () Function of Opencv to Put Text on Images in Python. We use cookies to ensure that we give you the best experience on our website. image It is the image on which the rectangle has to be drawn. A better way is use glob.glob to get the specific type of filenames. The image format is chosen based on the filename extension (see cv::imread for the list of extensions). Third, close the file using the close() method. You may have to find the shape of your specific text this using Paint or other application. Add text property using image object. At the bottom of the photo, tap Edit (three horizontal lines). Related Posts. Some links in our website may be affiliate links which means if you make any purchase through them we earn a little commission on it, This helps us to sustain the operation of our website and continue to bring new and quality Machine Learning contents for you. The syntax of imwrite () function is: cv2.imwrite(path, image) where path is the complete path of the output file to which you would like to write the image numpy array. Displaying an Image. Here we will explain to you cv2.putText() syntax along with few examples so that it can be understood clearly, especially for beginners. Now, go ahead and install the EasyOCR module the tool we need for extracting text from images. We covered the syntax of the cv2.putText() function along with various examples for a better understanding of beginners. Module : TP Computer Vision (Vision Artificielle) TP N : 02 Image Processing using Python-OpenCV The main objective of this set of . In this tutorial, you learned about how to use OpenCV putText() method to write text on image. Solution 1. Final images for each subject should be in grayscale, adjusted for the effect on illumination . thickness Line thickness. Python PIL (Python Image Library) OpenCV (Computer Vision) . a.txt feature.py img01.jpg img01.png imgs img02.jpg img02.png tt01.py tt02.py utils.py 1 directory, 9 files All Languages >> Python >> opencv python print text on image "opencv python print text on image" Code Answer. The second argument is the image that you want to display. OpenCV (Open Source Computer Vision Library) is a library of programming functions mainly aimed at real-time computer vision. Let us see this function in action by calling it below. In order to write the images or save the images to the local file system, we make use of a function called the imwrite () function in OpenCV. For BGR, we pass a tuple. The function imwrite saves the image to the specified file. By Faizan Amin. References:if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'machinelearningknowledge_ai-leader-1','ezslot_2',139,'0','0'])};__ez_fad_position('div-gpt-ad-machinelearningknowledge_ai-leader-1-0'); Save my name, email, and website in this browser for the next time I comment. How to Properly Resize an Image with Python using OpenCV. Sort: Best Match . There are many scenarios where you may have to write text on an image either to annotate or maybe just for doing debugging, etc. It can process images and videos to identify objects, faces, or even the handwriting of a human. How do I edit text in an image in Python? 5.2 ii) Preprocessing the Image. I need actual written python code to run! Running this will show the video file being read (by the filesrc element), decoded (decodebin element) and sent to the Gstreamer equivalent of /dev/null (fakesink element). text you want to write on image. But there is a workaround for achieving this effect. My code I'm using is here: import cv2 import numpy as np image = cv2.imread (r'redbox.jpg') def image_mod (image, binary): orig_shape1 = image . 5.1 i) Importing libraries and Images. font family font size font color font stroke width In the above example, we have provided a sample image, and wrote some text on the image. cv2. Open Image. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page. This, of course, is useful for adding any type of text caption you need to any image. convert the image to mono with cvtColor use threshold with binary_inverse and a zero threshold value use findContours with list and filter contours by area From here you can get the remaining contour rectangle and extract/save this roi in the original image to a file. Syntax: cv2.putText (image, text, org, font, fontScale, color [, thickness [, lineType [, bottomLeftOrigin]]]) How to write Text on Image? text - It is the text that needs to be put on the image This function takes in the image, font, coordinates of where to put the text, color, thickness, etc. It needs to ping the authorization URL, get the code, then pass the code to get the Bearer token.16 maj 2014 . This process is simply called "Text Recognition" or "Text Detection". Now that you have made the changes to image, save it with save() command. image on which you can write the text. Below the message variable definition, add this code: font = ImageFont.truetype ("arial.ttf", size=20) We create an instance of ImageFont in which we want to have our text use the Arial font with a font size of 20px. The second argument is the text (string) we want to put on . OpenCV PIL . Tap the Markup icon (squiggly line). To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. The cv2.putText () function only draws the text at the desired location and doesn't account for the rotation. The result of this function will change . OpenCV Python is a library of programming functions mainly aimed at real-time computer vision and image processing problems. Had to come up with it myself as no one was spelling this out anywhere (or google couldn't find it) Raw center_text_on_image.py #!/usr/bin/env python import numpy as np import cv2 from time import sleep # create blank image - y, x img = np. img It is the image on which the text has to be written. October 19, 2021. OpenCV allows a user to add text to any image. It can read and recognize text in images and is commonly used in python ocr image to text use cases.09-Aug-2022. we will se how to use cv2.imread('lena.j. Syntax: cv2.line(image, start_point, end_point, color, thickness) Parameters: image: It is the image on which line is to be drawn.10-Jun-2022. In general, only 8-bit single-channel or 3-channel (with 'BGR' channel order) images can be saved using this function, with these exceptions: writing text in opencv python draw image with text opencv python cv2.puttext (img,fps, bottomleftcorneroftext, font,fontscale, fontcolor,linetype) systemerror: <built-in function puttext> returned null without setting an error cv2 render text cv 2 put text cv2.font how to put text in cv python cv2 write text in image write on cv2 text 4 Image Segmentation in OpenCV Python. Best Match; Relevance; Date; Quality Score; Views; In the below example, we have created a black color rectangle and have written the text inside it by calculating the various coordinates. OpenCV contains putText () method which is used to put text on any image. Import PIL. Here is how its done in OpenCV You can add text to your image using cv2.putText () function For example: cv2.putText (img,'OpenCV', (10,500), font, 4, (255, 255, 255), 2, cv2.LINE_AA) Check THIS LINK for more details Here is an example: In this article, you will learn how to extract text from image using Python OpenCV and OCR. First, open the text file for writing (or append) using the open () function. Next, we call draw() method to add text to our image. In order to do so, a call to the cv::imread function loads the image using the file path specified by the first argument. The following section discusses the various other potential solutions. We have written the output image to a file. thickness It is the thickness of the line. Save my name, email, and website in this browser . In the below example, we split the text based on the newline character and then write each of the lines on the image in a loop. Put Text on Image using OpenCV Python, add text to image opencv, opencv puttext example, python write on image opencv, write in images cv2Hello guys my name . The code we will analyze was tested on Windows 8.1, with version 4.1.2 of OpenCV. cv2.putText () method is used to draw a text string on any image. Print text Inverse Search Loose Match Exact Match. First we will import PIL library into our code. JavaScript (/ d v s k r p t /), often abbreviated as JS, is a programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS.As of 2022, 98% of websites use JavaScript on the client side for webpage behavior, often incorporating third-party libraries.All major web browsers have a dedicated JavaScript engine to execute the code on users . In this post, I will show you how to extract text from an image using OpenCV and OCR. This can again be simply added using the function cv2.putText () It takes in parameters for the positioning and customization of the text (font, format, color, size) in the image. How do you write text on an image in Python? OCR or Optical Character Recognition is a system that can detect characters or text from a 2d image. Facult de Technologie Dpartement D'lectronique et tlcommunication Filire : lectronique des systmes embarqu Anne universitaire : 2022/2023 Option : ESEM Niveau : Master 2 Enseignant : MOKADEM Zakaria. First, you need to setup your Python Environment with OpenCV. Weve shown how to use programming to solve the Python Opencv Write Text On Image problem with a slew of examples. We have written the output image to a file. Python 2022-05-14 01:01:12 python get function from string name Python 2022-05-14 00:36:55 python numpy + opencv + overlay image Python 2022-05-14 00:31:35 python class call base constructor STRING. When it is true, the image data origin is at the bottom-left corner. We have to use certain workarounds to achieve this. Let us create a powerful hub together to Make AI Simple for everyone. Thanks for reading!! pt2 Vertex of the rectangle at the bottom right corner. Download ZIP Center text on an image with Python and OpenCV. . By using our site, you Have a look at its syntax, followed by the arguments: putText (image, text, org, font, fontScale, color) As usual, the first argument is the input image. . I'm looking for someone to create a python script that creates the attached image: Specifically, I am looking for a python function/clas. import matplotlib.pyplot as plt. . 1 Code Answers . In this article, we show how to add text to an image in Python using the OpenCV module. org Bottom-left corner of the text string in the image. In more technical terms, RGB describes a color as a tuple of three components. Second, write to the text file using the write() or writelines() method. The imwrite () function takes two parameters namely file_path and image. Show that edited Image. Draw Rectangle on Image 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 # Video: https://youtu.be/GTmo1D0AeU0 How do you write text on OpenCV? In July 2020, Luxonis and the OpenCV organization launched a Kickstarter campaign to fund the creation of these fantastic embedded AI boards. Drawing (Rectangles, Circles & Text) using OpenCV. In this tutorial we will write text on images using opencv cv2.putText()method. Syntax: cv2.putText (image, text, org, font, fontScale, color [, thickness [, lineType [, bottomLeftOrigin]]]) Parameters: image: It is the image on which text is to be drawn. $ tree . zeros ( ( 600, 1000, 3 ), np. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Full Stack Development with React & Node JS (Live), Fundamentals of Java Collection Framework, Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Perspective Transformation Python OpenCV, Top 40 Python Interview Questions & Answers, Face Detection using Python and OpenCV with webcam, Adding new column to existing DataFrame in Pandas, How to get column names in Pandas dataframe, Python program to convert a list to string, Reading and Writing to text files in Python. Otherwise, it is at the top-left corner. Write Text at the center of the image using Python cv2.puttext. But there is a workaround for achieving this effect. gstreamer python github, Hi Jetson Nano Gstreamer . Syntax: cv2.putText(image, text, org, font, fontScale, color[, thickness[, lineType[, bottomLeftOrigin]]]). In OpenCV, you display an image using the imshow () function. Next, we open image, say, /home/ubuntu/image. The second argument is optional and specifies the format in which we want the image . Most of you might have used cv2.putText (), if not this is how it looks like. If you know the shape (width, height) of the text you are writing on the image, then you can place at center aligned on the image. The Python version used was 3.7.2. . This function is defined in <imgproc.hpp> header. We have written the output image to a file. . This process is simply called . How to draw text on the image We will start by importing the cv2 module, which will expose to us the function we need to draw text on an image. Next, we open image, say, /home/ubuntu/image. Pytesseract or Python-tesseract is an OCR tool for python that also serves as a wrapper for the Tesseract-OCR Engine. cv2.putText() does not have any built-in capabilities to have a background color for the text. pt1 Vertex of the rectangle at the top left corner. 3. cv2.putText () - Add text to resized image. 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Input Image: sample.png Output Image: output.png Python - Write Text at the center of the image import easyocr. cv2.imwrite () returns a boolean value. In this article, we will understand how to put text on images in OpenCV using cv2.putText() function. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); MLK is a knowledge sharing community platform for machine learning enthusiasts, beginners and experts. Step 3: Pass the parameters in to the puttext () function. Here's the syntax: imshow (window_name, image) This function also takes two arguments: The first argument is the window name that will be displayed on the window. OpenCV is an open-source computer vision and machine learning software library of programming functions mainly aimed at real-time computer vision. The first argument of the putText () function is the image we want to put the text. Data Structures & Algorithms- Self Paced Course, OpenCV - Facial Landmarks and Face Detection using dlib and OpenCV, Python | Corner detection with Harris Corner Detection method using OpenCV, Python | Corner Detection with Shi-Tomasi Corner Detection Method using OpenCV, Python OpenCV | cv2.copyMakeBorder() method. This function is defined in if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'machinelearningknowledge_ai-box-4','ezslot_4',136,'0','0'])};__ez_fad_position('div-gpt-ad-machinelearningknowledge_ai-box-4-0'); OpenCV putText() function does not support writing text on multiple lines out of the box. Streaming audio and video in sync for mp4 container. #include <opencv2/imgcodecs.hpp> Saves an image to a specified file. line() method is used to draw a line on any image. cv2.putText() method is used to draw a text string on any image. How to Add Text to Image in Python Import PIL. hpp> header.10-Mar-2021, OCR with Pytesseract and OpenCV. There are many different approaches to solving the same problem Python Opencv Write Text On Image. 5 1. eg: (255, 0, 0) for blue color.thickness: It is the thickness of the line in px.lineType: This is an optional parameter.It gives the type of the line to be used.bottomLeftOrigin: This is an optional parameter. txt files places It shows about base64 encoding only and i have no problem with base64 encoding an image or a string For example, the filename "test \r This can be useful for populating image fields or for embedding an attachment in XML data . if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[468,60],'machinelearningknowledge_ai-medrectangle-3','ezslot_5',134,'0','0'])};__ez_fad_position('div-gpt-ad-machinelearningknowledge_ai-medrectangle-3-0');We will write a utility function that helps to create an empty image of the size 512512 and 3 color channels. To do this, use the putText () function in OpenCV. 0 basic to advance with python, deep learning python visibledeprecationwarning stack, practical text classification with python and keras real, neural networks and deep learning coursera, deep learning with python book, machine learning amp deep learning in python amp r udemy, bol com python machine learning To put text in an image, we first need to declare the matrix which will load the image. The great thing about this is, since it can be done programmatically with a module such as OpenCV, text can be added to an . The syntax of this function is shown below if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[468,60],'machinelearningknowledge_ai-box-3','ezslot_9',133,'0','0'])};__ez_fad_position('div-gpt-ad-machinelearningknowledge_ai-box-3-0'); cv2.putText(img, text, org, fontFace, fontScale, color, thickness), Before starting the examples let us first import the required libraries as shown below . OCR is a widely used technology. Now, lets get to the meat of the post - adding text to the image. Computer Science questions and answers. Open Image. OpenCV: is a Python open-source library, for computer vision, machine learning, and image processing. Lets use the below image to write a Good Morning message using OpenCV putText() method. 5.3 iii) Defining Parameters. Second, write to the text file using the write () or writelines () method. OpenCV-Python is a library of Python bindings designed to solve computer vision problems. The coordinates are represented as tuples of two values i.e. Next, we call draw () method to add text to our image. If you know the shape (width, height) of the text you write on the image, you can put it in the center aligned on the image. color Line color. Numpy log10 Return the base 10 logarithm of the input array, element-wise. Here are the steps for the images below. Multiple Object Tracking with Unique IDs . In this tutorial, we will learn how to write string text on Images in Python using the OpenCV putText() method. 1. Put Text on Image in OpenCV Python : cv2. OpenCV Python is a library of programming functions mainly aimed at real-time computer vision and image processing problems. Install the OpenCV library You can install the package using the pip command as below: pip install opencv-python Install OpenCV To use OpenCV in your Python project you will need to import it. OpenCV contains putText() method which is used to put text on any image. Write, Show Images in OpenCV. We can write text with different size and style on images with different background and foreground styles using OpenCV. fontFace: Font type, various types of fonts are provides in HersheyFonts. The parameter file_path to the imwrite () function is the location of the file in which the image is to be written or saved. The approximate shape of the text in the above example is (268, 36). fontScale Font scale factor that is multiplied by the font-specific base size. How do you draw a filled rectangle in OpenCV Python? If you continue to use this site we will assume that you are happy with it. Search for jobs related to Write text on image python opencv or hire on the world's largest freelancing marketplace with 20m+ jobs. Unfortunately, when I write an image array with imwrite () and then read it with imread () later, the arrays returned are different. It's just two lines of code. 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